Automatic recording-gage.



W. E. JERAULD.

AUTOMATIC RECORDING GAGE.

APPLICATION FILED 1320.31, 1906.

Cz 7cesses Q. Q, 730% THE mum's rzrrks co.. wasnmp-mn. n. c.

PATENTED JAN.21, 1908.

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w. E JERAULD. AUTOMATIC RECORDING GAGE.

APPLICATION FILED DEO.31. 1906.

@zpegas; Q, Q Mam-L 0? No. 877,198. PATENTED JAN. 21, 1908. W. B.JERAULD.

AUTOMATIC RECORDING GAGE.

APPLICATION FILED DEC. 31. 1906.

3 SHEETS-SHEET 3.

UNITED STATES PATENT onnr.

WILLIAM E. JERAULD, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO AMERICAN STEAMGAUGE & VALVE MANUFACTURING COMPANY, OF BOSTON, MASSACHUSETTS, ACORPORATION OF NEW JERSEY.

AUTOMATIC RECORDING-GAGE.

Specification of Letters Patent.

Patented Jan. 21, 1908.

To all whom it may concern:

Be it known that 1, WILLIAM E. JERAULD, of Boston, in the county ofSuffolk and State of Massachusetts, have invented certainnew and usefulImprovements in Automatic Recording-Gages, of which the following is aspecification.

This invention relates to pressure gages and its object is to providesuch gages with devices for making permanent records of pressures, andfor shifting one or more of the devices after each application ofpressure, so

that the several records will be separate and distinct from each other.The principal use of this gage is in recording pressures which fluctuategreatly, that is rise quickly from Zero to the maximum and again quicklysubside, and the essence of the invention consists in shifting therecord receiving sheet after each subsidence of the pressure so that afresh portion of the sheet will be at hand to receive a record of eachnew augmentation of the pressure.

In the accompanying drawing,Figure 1 shows an elevation of the gage withthe front parts partially broken away showing the principal parts of myinvention. Fig. 2 represents a cross section on the line 22 of Fig. 1.Fig. 3 represents a section taken at right angles to that of Fig. 2 andat one side of the center. Fig. 4 represents a fragmentary sectionalelevation showing the pressure recording devices. Fig. 5 represents anexternal elevation showing the character of dials used. Fig. 6 is adetail elevation of part of the dial shifting mechanism.

The gage constituting my invention consists of the usual curved Bourdonspring tube 1 which receives fluid under pressure from the inlet 2whereby the free end 3 of the spring tube is deflected. This deflectionacts through a link 4 and arm 5 to turn a rock shaft 6 carrying an arm 7upon the end of which is supported an ink receptacle 8 having a markingpoint 9 in contact with the surface of a dial 10. These parts are commonto very many well known forms of recording gages and which do notconstitute any part of my invention.

In industrial manufacture, there are many operations where pressures areused for brief intervals of time and are frequently repeated, such asthat of forcing the tires or rims of car wheels on the wheels byhydraulic pressure, and it is of importance that a record of thepressures employed in each operation should be preserved, and in orderthat the records should be accurately and properly identified with theseveral operations, they should be made automatically. Accordingly inaddition to the usual mechanism for recording pressures, I provideadditional devices for shifting the dial after each record is made, sothat a fresh surface may be presented for the next record and that allof the records may be separate and distinct from each other.

The dial shifting devices consist of an arbor 11, to which the dial isdetachably secured, a ratchet wheel 12 secured to the arbor, a pawl 13adapted to co-act with the ratchet wheel, a pawl carrier 15, and thelever 16 pivoted at a fixed point 17 and connected with the end 3 of thetube by a link 18, and with the pawl carrier by a link 19.

It will be seen that when pressure is applied to the tube, the free end3 of the latter is moved outward from the center of the gage, and actstoswing the pawl carrier in right hand rotation, thereby retracting thepawl and causing it to drop behind an adjacent tooth. lVhen the pressureis relieved, the end of the tube returns to its normal position andcauses the pawl to move in the opposite direction, engaging a ratchettooth and pushing the ratchet and dial forward a step. As the ratchetand pawl form the only rotating power for moving the dial, it will beevident that the latter remains stationary while the pressure increases,so that the rec 0rd of the increasing pressure consists of a single markextending substantially radial in a curved line from said gage. On thereturn of the spring and marking point to Zero position, the dial ismoved one step.

In order to limit the feeding of the dial so that the distances throughwhich it is advanced will be the same whether the pres sure employed isgreat or small, I provide a shield 20 for preventing the pawl moving theratchet more than the distance of one tooth at each actuation. Thisshield lies close beside the ratchet and has a circular peripheryextending beyond the tooth of the ratchet,

so as to support the toe of the pawl and hold it out of engagement withthe ratchet teeth. This shield has a single notch 2 1 with smoothlycurved sides, which is of sufficient length to allow the pawl to engageone of the teeth, and then to lift it out of engagement with the toothafter the'ratchet has been moved the required distance; Of course thenotch may be made of any width and the ratchet turned as far as desiredat each actuation, but preferably I construct it so that the distancethrough which it is turned is only that of one tooth.

- 22 represents a spring which is secured to a fixed bridge 23, and hasits free end bearing frictionally against the ratchet wheel to act as abrake, stopping the wheel when the ratchet has been lifted out ofengagement with it, and preventing the wheel being turned backward bythe friction of the pawl on the inclined face of a tooth and thefriction of the pawl carrier upon the arbor 11.

The dial, which is usually a sheet of flexible paper, is supported on atransverse plate 24;, and secured to the arbor by a wide collar 25 onthe latter, which has its outer surface flush with that of the plate,and by a clamping collar or washer 26. The latter is held tightlyagainst the dial by a clamping nut 27 threaded upon a stem 28 which isfrictionally secured to the arbor, and which also supports the'collars.In order to remove the dial, the nut 27 is unscrewed and the outercollar 26 removed, the reverse of this step being performed in applyinga new dial.

In order to prevent the arbor from rotating when the nut is turned, forthe arbor is mounted so as to be freely rotatable, I provide a lockconsisting of a bolt 29, behind the ratchet wheel, and adapted to bemoved into and out of a hole 30 in the wheel. This lock is connected toa lever 31, which has a finger piece 32 on a rod 33 projecting throughthe glass covering 34 of the gage near one side of the casing. Bypushing inward on the finger piece, the bolt is projected into the holein the ratchet, being automatically withdrawn therefrom by the reactionof a spring 35 when pressure is removed from the finger piece. Thecharacter of the dial used with this gage is illustrated in Fig. 5. Ithas a number of concentric circles representing the distance from thecenter through which the marking point must move in registering certainpressures, while near the center it has a series of figurescorresponding to the num ber of teeth on the ratchet wheel and capableof identifying the records.

- 1. Agage for recording successive pressures, comprising incombination, a' curved spring pressure tube, a dial-holding arbor, a

ratchet secured to said arbor, a pawl carrier, a pawl mounted thereon,and connections olning the pawl carrier with the pressure 1 tube foroscillating the same and turning this arbor step by step at each returnof the tube to normal position said ratchet, pawl-carrier andconnections being approximately in ;the plane of the tube and within thespace inclosed thereby.

2. The combination with the curved tube, dial holding arborapproximately at the center of curvature of the tube, and marking pointof a recording pressure gage, of a ratchetsecured to said arbor, apawl-carrier oscillative about said arbor, a pawl pivoted to the carrierto engage the ratchet, and operating connections between the carrier andfree end of the tube arranged to advance the ratchet as the tube returnsto low pressure position.

3. The combination with the curved tube, dial holding arborapproximately at the center of curvature of the tube, and marking pointof a recording pressure gage, of a ratchet secured to said arbor, apawl-carrier oscillative about said arbor,,a pawl pivoted to the carrierto engage the ratchet, and operating connections consisting of a pivotedlever linked respectively to the carrier and free end of the tubearranged to advance the ratchet'as the tube returns to low pressureposition.

4. The combination, in a pressure gage, of 9 a Bourdon tube, an armcarrying a marking point and connected with the tube for actuationthereby, a holder carrying a dial adapted to be marked by said point, aratchet to which said dial holder is connected, apawl 100 carriermovable in a plane parallel to that of the marking point, a pawl pivotedthereto adapted to drive the ratchet, and connections including a leverand connecting links between said pawl carrier and the free end of 105the Bourdon tube whereby the latter is caused to oscillate the carrier.

5. In a device of the character described, in combination with thepressure-indicating and recording mechanism, a freely rotatable arbor, aholding screw for detachably clamping a dial thereto, a ratchet securedto said arbor, a pawl for rotating said ratchet and dial, and a lockadapted for detachable engagement with the ratchet to hold it stationarywhile the dial-clamping screw is being turned. a V

, 6. In a'device of the character described, in combination with thepressure-indicating and recording mechanism, a freely rotatable arbor, aholding screw for detachably clamping a dial thereto, a ratchet securedto said arbor, a pawl for rotating said ratchet and dial, a locking pinadapted to enter a recess in the ratchet, and a lever having an external finger-piece for projecting the pin into engagement with theratchet to hold the latter stationary and permit releasing or securingof a dial.

7. In a device of the character described,

in combination With the pressure-indicating tent of engagement of thepawl With the and recording means, a ratchet to which a ratchet.

record-receiving dial is adapted to be secured, In testimony whereof Ihave aflixed my a pawl driven by said pressure-indicating signature, inpresence of tWo Witnesses. means for rotating the ratchet step by step,WILLIAM E. JERAULD. and a shield of greater diameter than the Witnesses:ratchet having a recess in its periphery 10- C. F. BROWN, cated besidethe ratchet for limiting the eX- A. C. RATIGAN.

